Antenna construction



May 7, 1929.

M. BERNARD ANTENNA CONSTRUCTION Filed March 10, 1924 wuewcoz MARCEL BERNARD @51 m aw a @M y, i/m

Patented May 7, 1929.

UNITED STATES MARGEL BERNARD,

on PARIS, FRANCE.

ANTENNA CoNs'rnUCrIoN,

Application filed March 10, 1924, Serial No. 698,027, and in France June 7, 1923.

The present invention in general relates to an improvement in antenna construction for the reception or transmlssron of radio waves.

More specifically my invention relates to an antenna construction comprising a plu rality of sections, all of which are employed for the reception or transmission of waves of certain wave lengths and the various sections of which are employed independently of each other for the reception ortransmission of waves of different wave lengths.

One of the objects of my invention is to providean inexpensive antenna construction for the reception or transmission of waves of different wave lengths. V

The principal object of my invention is the elimination of undesirable interferences between various sections of the antenna.

The constructionand mode of operation of the invention together with further objects and advantages will best be understood with reference to the following description taken in connection with the accompanying drawings, in which Fig. 1 is a perspective View of an antenna construction withall sections of the antenna in operative connection.

Fig. 2 is the same as Fig. 1 except that an inoperative section is removed from the influence of an operative section. n

Fig. 3 is a perspective view of a modification of my invention.

Fig. 4 is a perspective view of another modification of my invention.

\ Referring to Fig. 1, the support for the antenna. wires comprises a peripheral portion A and a central portion B flexibly secured along one of its edges to the peripheral port for the peripheral section of the an-- tenna, the said section comprising a pancake coil having a plurality of turns spaced comparatively far apart and adapted when used alone for the reception or transmission of comparatively short waves.

The central portion B serves as a support for the central section of the antenna, the said section comprising a pancake coil having a plurality of comparatively closely spacedturns and adapted when used alone for the reception or transmission of comparatively longer waves.

The operation of my invention as shown by Figs- 1 and 2 and described above is as fol-v lows: When short waves are to be received or transmitted, the central section of the antenna is disconnected from the peripheral section and the central portionrolled up as shown in Fig. 2. (Such an arrangement eliminates all interference between the active section and the inactivesection with a consequent increase in the efliciency of transmission and reception.

Ina similarmanner if waves of longer length are to be received or transmitted the peripheral section of the aerial is disconnected from the central section and the peripheral portion then rolled up thereby eliminating all interference between the two sections.

If waves of a still longer wave length are to be received or transmitted both sections may be connected in series. The two sections may also be connected in parallel for the reception or transmission of waves of a still different wavelength. a

In Fig. 3, which is a modification of my invention, the central portion B is pivotally mounted within the peripheral portion A, all interference between the two sections being eliminated by adjusting the central portion B to a suitable angular position with respect to the peripheral portion 'A.

In Fig. 4, which is another modification, the central portion B is hinged to an inner edge of the peripheral portion A, all interference between the two sections being eliminated by adjusting the central portion B to a suitable angular position withrespec t to the peripheral portion A. I

Although I have shown several preferred embodiments of my invention,-I wish it to be distinctly understood that I do not limit myself to said embodiments; but may employ such other modifications as are embraced within the scope and spirit of my invention.

Having described my invention, what I claim is: 1

1. In radio signalling, a, loop antenna, a plurality of sections comprising said antenna and arranged in the same plane, a peripheral flexible support for one of said sections and a central flexible support connected to the peripheral support for the other of said sections whereby either of said supports may be rolled up to remove one section from the plane of the other section to thereby substantially eliminate all interference between the two sections.

In radio signalling, a loop antenna con1- prising an exterior loop and an interior loop of different numbers of turns, said loops being flexibly supported and so arranged as to be used independently or in combination for the reception or transmission over a comparatively Wide range of Wave-lengths.

3. In radio signalling, a loop antennaconr prising a plurality of flexible supporting elements, a plurality of coils supported by said sections and means to selectively use said coils independently or in con'ibinationftor the reception over a comparatively Wide rangeot Wavelengths.

4. In radio signalling, a loop antenna comprising a plurality of independent loops sections normally disposed in the same plane and one Within the other, said loop sections having different numbers of turns and capable of independent-use for different Wave-lengths,

and connections for arranging said loop sections in series or in parallel to still further vary the Wave-length to be received.

5. In radio signalling, a loop antenna comprising a plurality of flexible loop sections,

each loop section having a different number of turns and capable of being used independently, in series or in parallel for the reception or transmission on diflerent Wave length ranges.

6. In radio signalling, a loop antenna comprising a plurality of flexible loop sections, each loop section being capable of being removed from the influence of the remaining sections when used independently, said loop sections also beingarranged to be connected ]acent section along one edge, whereby any section or sections may be conveniently re-' moved from the influence of the remaining sections.

MARGEL BERNARD. 

